1. Diffusion and Osmosis

2. On a blank sheet of paper
TSWBAT identify the process of osmosis and diffusion via the gummi bear lab -analyze diffusion through a sand baggie and apply the concepts of hypotonic, hypertonic, and isotonic to the activity
On a blank sheet of paper
Write the equation for cellular respiration.
Where does cellular respiration occur in the cell?
List the organelles that help to make proteins
What is the difference between the rough and the smooth endoplasmic reticulum?

3. Diffusion
Solvent – what dissolve something
Solute – what is being dissolved
Solute molecules moving from an area of high concentration to an area of low concentration
Random motion drives diffusion
Movement is based on kinetic energy (speed), charge, and mass of molecules
Equilibrium is reached when there is an even distribution of solute molecules
(water) 2 3 1 4

4. Osmosis Diffusion of water through a semi-permeable membrane
Semi-permeable: permeable to solvents (WATER), but not to large molecules
High [water] to low [water]
Dissolved molecules (i.e. glucose, starch) are called solutes
REMEMBER:
Water = solvent
Glucose, Starch = solutes

5. Effect of Water on Cells
Hypertonic Environment
High [solute], low [water]
The cell will shrink
Plasmolysis – cell death
Hypotonic Environment
High [water], low [solute]
Plants – turgor pressure – plant like this!!
Animals – cytolysis – cell bursting
Isotonic Environment
[water] = [solute]
Hypertonic
Hypotonic
Isotonic
Part 3 pg. 85

6. Osmosis in Living Cells
Cellulose in cell wall

7. Osmosis in Red Blood Cells
Isotonic
Hypotonic
Hypertonic
0.9% saline
10% NaCl
Distilled water
Plasmolysis
Predictions?

8. Osmosis in Plant Cells Plasmolysis . 10% NaCl Distilled water
Hypertonic
Plasmolysis .
10% NaCl
Distilled water
Hypotonic
Predictions?

9. Animations Dialysis Bag Experiment
Elodea Cell
Osmosis

10. Transportation of Molecules
Passive Transport
Movement of molecules across a semi-permeable membrane
no energy required
Active Transport
Movement of molecules across a semi-permeable membrane against a concentration gradient with a protein
ENERGY – ATP
Facilitated Diffusion
Movement of molecules across a semi-permeable membrane with a protein

11. Effect of Water on RBC